The Neuchâtel Crisis (1856–1857) was the result of a diplomatic question between the Swiss Confederation and the King of Prussia regarding the rights of the Royal House of Prussia to the Principality of Neuchâtel. The Principality of Neuchâtel was granted to the Royal House of Prussia in 1707, then was ruled by Napoléon Bonaparte after Frederick William III of Prussia was deposed as Prince of Neuchâtel. In 1814, the Principality was again granted to Frederick William, and the following year he agreed to allow the Principality to join the Swiss Confederation (which was an alliance of semi-independent states rather than a single country) while remaining under his rule.
The Principality successfully revolted against Prussian rule in 1848. In 1849, the Prussian government began to press for recognition of their right to Neuchâtel. Several states proposed that Neuchâtel be separated from but remain allied with the Swiss Confederation. The British government sought to establish a diplomatic agreement, with the support of the French. The King of Prussia continued to press for his rights on the matter.
On September 2–3, 1856, there was a revolt by the Neuchâtel royalists, loyal to the prince, which brought the situation to a crisis. The revolt failed and the royalists were made hostage. Negotiations began between France, the United Kingdom, Prussia and Russia for the future of Neuchâtel, with the United Kingdom strongly supporting the independence of the Principality. This conference took place in 1857. Prussia finally yielded its claim to Neuchâtel at the insistence of the other powers.
- Oechsli, Wilhelm (1922). G. W. Protbero, eds. History of Switzerland, 1499-1914. Cambridge historical series. trans. Eden Paul, Cedar Paul. Cambridge University Press. pp. 439–446.
- Stöckli, Rita: Neuenburgerhandel in German, French and Italian in the online Historical Dictionary of Switzerland, 27 April 2010.
- Trebein, Bertha Eleanor (1916). Theodor Fontane as a critic of the drama. Columbia University Germanic studies. Columbia University Press. p. 19.